Express each of the following odd numbers are the sum of 3 prime numbers

$$3 + 5 + 7 = 15$$

Verify: 3 is prime, 5 is prime, 7 is prime.

$\mathbf{15 = 3 + 5 + 7}$

21:

$$7 + 7 + 7 = 21$$

Verify: 7 is prime (used three times).

$\mathbf{21 = 7 + 7 + 7}$

27:

$$3 + 7 + 17 = 27$$

Verify: 3 is prime, 7 is prime, 17 is prime.

$$3 + 7 = 10$$ $$10 + 17 = 27$$

$\mathbf{27 = 3 + 7 + 17}$

33:

$$11 + 11 + 11 = 33$$

Verify: 11 is prime (used three times).

$\mathbf{33 = 11 + 11 + 11}$